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Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) $ in Thousands | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Total risk-based capital, actual amount | [1] | $ 728,051 |  | $ 596,411 |
Total risk-based capital, actual ratio | [1] | 0.1216 |  | 0.1279 |
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 479,113 |  | $ 372,929 |
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0800 |  | 0.0800 |
Common Equity Tier 1 risk-based capital, actual amount |  | $ 640,363 | [1] | $ 556,590 |
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1069 | [1] | 0.1194 |
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 269,501 | [1] | $ 209,772 |
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio |  | 0.0450 | [1] | 0.0450 |
Tier 1 risk-based capital, actual amount | [1] | $ 666,363 | [2] | $ 556,590 |
Tier 1 risk-based capita, actual ratio | [1] | 0.1113 |  | 0.1194 |
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 359,335 |  | $ 279,696 |
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0600 |  | 0.0600 |
Tier 1 risk-based capital, actual amount | [1] | $ 666,363 | [2] | $ 556,590 |
Leverage, actual ratio | [2] | 0.0885 |  | 0.0886 |
Leverage, minimum for adequately capitalized amount | [2] | $ 301,181 |  | $ 251,348 |
Leverage, minimum for adequately capitalized ratio |  | 0.0400 | [1] | 0.0400 | [2]
Leverage, actual amount | [2] |  |  | $ 556,590 |
Subsidiaries [Member] |  |  |  |  |
Total risk-based capital, actual amount | [1] | $ 697,115 |  | $ 577,078 |
Total risk-based capital, actual ratio | [1] | 0.1167 |  | 0.1242 |
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 477,688 |  | $ 371,809 |
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0800 |  | 0.0800 |
Total risk-based capital, minimum for well capitalized amount | [1] | $ 597,110 |  | $ 464,761 |
Total risk-based capital, minimum for well capitalized ratio | [1] | 0.100 |  | 0.1000 |
Common Equity Tier 1 risk-based capital, actual amount |  | $ 635,427 | [1] | $ 537,257 |
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1064 | [1] | 0.1156 |
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 268,700 | [1] | $ 209,142 |
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio |  | 0.0450 | [1] | 0.0450 |
Common Equity Tier 1 risk-based capital, minimum for well capitalized amount |  | $ 388,122 | [1] | $ 302,095 |
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio |  | 0.065 | [1] | 0.0650 |
Tier 1 risk-based capital, actual amount | [1] | $ 635,427 |  | $ 537,257 |
Tier 1 risk-based capita, actual ratio | [1] | 0.1064 |  | 0.1156 |
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 358,266 |  | $ 278,857 |
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0600 |  | 0.0600 |
Tier 1 risk-based capital, minimum for well capitalized amount | [1] | $ 477,688 |  | $ 371,809 |
Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.080 |  | 0.0800 |
Tier 1 risk-based capital, actual amount | [1] | $ 635,427 |  | $ 537,257 |
Leverage, actual ratio | [2] | 0.0845 |  | 0.0857 |
Leverage, minimum for adequately capitalized amount | [2] | $ 300,927 |  | $ 250,871 |
Leverage, minimum for adequately capitalized ratio | [2] | 0.0400 |  | 0.0400 |
Leverage, actual amount | [2] | $ 635,427 |  | $ 537,257 |
Leverage, minimum for well capitalized amount | [2] | $ 376,159 |  | $ 313,588 |
Leverage, minimum for well capitalized ratio | [2] | 0.050 |  | 0.0500 |
[1] | Ratio is computed in relation to risk-weighted assets.
[2] | Ratio is computed in relation to average assets.

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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Amount of Tier 1 leverage capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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